A 14-year-old girl has been sexually assaulted while swimming at a popular Melbourne beach last month.
The teen was swimming with her friends off Middle Brighton Pier on the afternoon of January 13 when a man grabbed her.
The girl was swimming back to a ladder along the pier at the time of the attack.
Police say the man is in his 20s, with short dark hair, a solid build, and blue-green eyes.
He was last seen swimming away from the area.
Detectives have released a composite image of him they hope will help in their investigation.
Police say anyone who recognises the man or has any other information should contact Crimestoppers.